I'm really confused about my thermostat situation and could use some help. I've got central AC in my apartment, but the air vent is always blowing cool air, no matter what I set the thermostat to—heat, cool, or even off. It's like the cool air just never stops!
I've attached a couple of pictures: one of my old thermostat wiring and another of the new Sensi smart thermostat I'm trying to install. The problem is that the old thermostat only had three wires connected, and I can't tell where the orange wire is supposed to go since the image quality isn't great. I also found a blue and black wire that was taped up but don't know what these are for.
My apartment is about 10 years old, has no gas supply, and I can't find any electric furnace in here. I talked to the building management for info about HVAC but got nowhere. Can anyone give me some clues on how to wire this correctly?
1 Answer
Have you tried disconnecting the thermostat completely? If it controls the unit, the airflow should stop when it’s off. That might help determine if the airflow is just standard ventilation or something else. If you disconnect it and the airflow continues, then it seems like you might not actually be using AC; it could be some kind of cold ventilation that's running.
It sounds like you might have a setup where the old thermostat was intended for heating and not cooling. It’s possible the system isn’t actually configured to cool your apartment correctly.
I just tested that, and it does turn off the ventilation when I disconnect the thermostat. So I guess it’s just cool ventilation all the time! But even when I plug the thermostat back in and turn on the cooling option, the air doesn’t change temperature; it still just feels cool.